Surface-Mounted Door Frame for Flush Fire-Resistant Installation
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Solution Overview
Problem
Conventional fire door frames for elevator shafts require protruding walls for mounting, increasing construction costs and reducing space in elevator lobbies, while also being prone to deformation and failure during fires due to high temperatures and rapid cooling.
Innovation Solution
A surface-mounted door frame system comprising a sub-buck portion and a shell portion, which eliminates the need for protruding walls by allowing surface mounting to a single wall surface, thereby enhancing structural integrity and resistance to warpage and deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional fire door frames are mounted using protruding walls, then the mounting stability is improved, but the construction cost increases and space in elevator lobbies is reduced
Solution Approach 1:
The door frame is divided into multiple components: a mounting plate that attaches to the wall and a frame body that attaches to the mounting plate. This segmentation allows the frame to be mounted flush against the wall surface without requiring protruding walls, while still providing stable mounting through the separate mounting plate component
Solution Approach 2:
The mounting approach transitions from three-dimensional protruding wall mounting to two-dimensional surface mounting. The mounting plate provides attachment points on the wall surface while the frame extends perpendicular to the wall, eliminating the need for protruding walls and maximizing lobby space
2Ease of manufacture
If conventional fire door frames are used, then the door frame can be mounted to protruding walls, but the frame is prone to deformation and warpage during fires due to high temperatures and rapid cooling
Solution Approach 1:
Separating the mounting function from the frame structure allows the frame to be optimized for fire resistance while the mounting plate handles installation. The frame can be designed with fire-resistant materials and geometry that resist thermal deformation, independent of mounting considerations
Solution Approach 2:
The frame geometry and material properties are optimized to resist thermal stress and deformation during fire conditions. The design accounts for thermal expansion and contraction, preventing warpage and maintaining structural integrity under extreme temperature variations
3Device complexity
If the door frame structure is simplified for surface mounting, then construction costs are reduced and space is maximized, but the structural integrity may be compromised
Solution Approach 1:
The separation of mounting plate and frame body allows each component to be optimized independently. The mounting plate provides robust wall attachment while the frame provides structural integrity for door support, achieving both simplicity and strength
Solution Approach 2:
The use of fire-resistant materials with appropriate mechanical properties ensures that the simplified surface-mounted structure maintains the necessary structural integrity and fire resistance performance
Data Source
AI summary
A door frame system comprises a wall and a door frame. The door frame comprises a sub-buck portion and a shell portion, coupled to the sub-buck portion. The sub-buck portion comprises a sub-buck mounting arm including at least one mounting aperture, a sub-buck rabbet arm coupled to one end of the sub-buck mounting arm and a sub-buck support arm coupled to the sub-buck mounting arm opposite the sub-buck rabbet arm. The sub-buck portion is surface mounted to a single surface of the wall through the at least one mounting aperture.